stages three and four on pp.95-104 (follow the relevant links on the four-stage method page of this website for a brief summary)

You should additionally read

Chapter Five, which discusses the presentation of Schenkerian graphs (a brief summary of Schenkerian notation can be found on the Presenting Schenkerian Graphs page of this website)

the rest of Chapter 3 (pp. 72 onwards)

it will help you in your work if you have also started on Part III of the Handbook, which offers case studies of various analytical issues.

It is important to keep in mind in these longer exercises that your graph should show how every passage in the music is an elaboration of either the preceding or succeeding note from the Ursatz. Your analysis should not contain 'islands' which cannot be related to the background structure.